// Copyright 2021 Wechat Group, Tencent
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include <type_traits>

namespace tfcc {

template <class T>
inline __device__ T atomic_add_wrapper(T* dst, T val) {
  return atomicAdd(dst, val);
}

inline __device__ float atomic_mul_wrapper(float* dst, float val) {
  unsigned* tmp = reinterpret_cast<unsigned*>(dst);
  unsigned old = *tmp;
  unsigned assumed, result;

  do {
    assumed = old;
    result = assumed;
    (*reinterpret_cast<float*>(&result)) *= val;
    old = atomicCAS(tmp, assumed, result);
  } while (assumed != old);

  return *reinterpret_cast<float*>(&result);
}

}  // namespace tfcc
